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Adjusted Cost and Estimated Market Value Available-for-sale Investments (Details) (USD $) In Thousands, unless otherwise specified | Sep. 30, 2013 | Mar. 31, 2013
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Available-for-sale securities, amortized cost: |  |
Amortized cost | $ 1,097,704 |
Available-for-sale securities, fair value: |  |
Estimated market value | 1,114,340 | 1,095,338
U.S. treasury, government, and corporate securities |  |
Available-for-sale securities, amortized cost: |  |
Due in one year or less | 25,259 |
Due after one year through five years | 186,894 |
Due after five years through ten years | 316,233 |
Due after ten years | 507,909 |
Amortized cost | 1,036,295 |
Available-for-sale securities, fair value: |  |
Due in one year or less | 25,520 |
Due after one year through five years | 195,909 |
Due after five years through ten years | 320,354 |
Due after ten years | 510,225 |
Estimated market value | 1,052,008 |
Mortgage-backed securities |  |
Available-for-sale securities, amortized cost: |  |
Amortized cost | 5,613 |
Available-for-sale securities, fair value: |  |
Estimated market value | 5,755 |
Redeemable preferred stock |  |
Available-for-sale securities, amortized cost: |  |
Amortized cost | 18,440 |
Available-for-sale securities, fair value: |  |
Estimated market value | 18,449 |
Common stock |  |
Available-for-sale securities, amortized cost: |  |
Amortized cost | 37,356 |
Available-for-sale securities, fair value: |  |
Estimated market value | $ 38,128 |

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- Definition Amount of available-for-sale debt securities at cost, net of adjustments, maturing in the sixth fiscal year through the tenth fiscal year following the latest fiscal year. Adjustments include, but are not limited to, accretion, amortization, collection of cash, previous other-than-temporary impairments (OTTI) recognized in earnings (less any cumulative-effect adjustments, as defined) and fair value hedge accounting adjustments. + References Reference 1: http://www.xbrl.org/2003/role/presentationRef -Publisher FASB -Name Accounting Standards Codification -Topic 210 -SubTopic 10 -Section S99 -Paragraph 1 -Subparagraph (SX 210.5-02.2) -URI http://asc.fasb.org/extlink&oid=6877327&loc=d3e13212-122682 Reference 2: http://www.xbrl.org/2003/role/presentationRef -Publisher FASB -Name Accounting Standards Codification -Topic 320 -SubTopic 10 -Section 50 -Paragraph 3 -Subparagraph (c) -URI http://asc.fasb.org/extlink&oid=27724398&loc=d3e27198-111563 + Details
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- Definition Amount of available-for-sale debt securities at cost, net of adjustments, maturing in the second fiscal year through the fifth fiscal year following the latest fiscal year. Adjustments include, but are not limited to, accretion, amortization, collection of cash, previous other-than-temporary impairments (OTTI) recognized in earnings (less any cumulative-effect adjustments, as defined) and fair value hedge accounting adjustments. + References Reference 1: http://www.xbrl.org/2003/role/presentationRef -Publisher FASB -Name Accounting Standards Codification -Topic 210 -SubTopic 10 -Section S99 -Paragraph 1 -Subparagraph (SX 210.5-02.2) -URI http://asc.fasb.org/extlink&oid=6877327&loc=d3e13212-122682 Reference 2: http://www.xbrl.org/2003/role/presentationRef -Publisher FASB -Name Accounting Standards Codification -Topic 320 -SubTopic 10 -Section 50 -Paragraph 3 -Subparagraph (b) -URI http://asc.fasb.org/extlink&oid=27724398&loc=d3e27198-111563 + Details
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